Quaternary Science Reviews最新文献

{"title":"The role of active channels in sediment transport to the Bengal Fan and their implications for climate and sediment source changes since 16 ka","authors":"Md Hafijur Rahaman Khan ,&nbsp;Jianguo Liu ,&nbsp;Yun Huang ,&nbsp;Zhong Chen ,&nbsp;Ananna Rahman","doi":"10.1016/j.quascirev.2024.109024","DOIUrl":"10.1016/j.quascirev.2024.109024","url":null,"abstract":"<div><div>The Bay of Bengal (BoB) is crucial in understanding sediment dynamics in the Indian Ocean. Analysis of sediment cores from the western BoB, focusing on the Middle and Lower Bengal Fan since 16,000 years ago, reveals rapid deposition within the submarine canyon. This deposition was driven by the Ganges-Brahmaputra (G-B) river system during lower sea levels, leading to the formation of turbidity currents. Increased glacial activity during cold phases enhanced physical weathering in the Himalayan highlands, affecting sediment transport to the BoB until the early Holocene. Following the early Holocene, the lower fan displayed a mixture of sources, while the deeper fan predominantly reflected Indian sources throughout the Holocene. Sediment contributions from the Indian subcontinental commenced after 9,100 years ago, becoming dominant since 7,000 years ago, particularly in arid-semiarid conditions in the middle to lower fan, primarily driven by monsoonal water currents. Cores located near active channels exhibited consistent sourcing patterns influenced by regional factors such as river systems and active channels since the mid-Holocene. Sediments with coarser-grain, higher smectite content, and primarily sourced from Indian rivers indicated an intensification of monsoonal currents since 9,100 years ago. Fluctuations in smectite/(illite + chlorite) ratios were correlated with changes in summer monsoon rainfall, impacting erosion and sediment dynamics. Active channels played a crucial role in transporting Himalayan sediments via the G-B river system to the deep ocean during periods of low sea levels, but their influence has diminished with rising sea levels. Therefore, the proximity of sediments to active channels denotes the dominance of Himalayan sources; however, sediment from the lower fan transitioned to Indian sources since 9,100 years ago, influenced by the combined effects of monsoonal currents, active channels, and underwater currents shaping sediment transport dynamics. During the Holocene Climatic Optimum (HCO), intensified summer monsoons led to increased sediment contributions from Indian sources, driven by water currents during the winter monsoon, with notable impacts after 7,000 years ago. This study highlights the complexity of sedimentary processes and provides insights into past environmental conditions, contributing to our comprehension of sediment deposition patterns in the northeastern Indian Ocean.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 109024"},"PeriodicalIF":3.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the origin of Holocene sea-level transgressions in formerly glaciated regions","authors":"Samuel J. Chester ,&nbsp;Jacqueline Austermann ,&nbsp;William J. D’Andrea ,&nbsp;Andrew J. Lloyd ,&nbsp;Roger C. Creel","doi":"10.1016/j.quascirev.2024.108986","DOIUrl":"10.1016/j.quascirev.2024.108986","url":null,"abstract":"<div><div>Over glacial cycles, the growing and shrinking of ice sheets has caused relative sea level (RSL) to differ from global mean sea level (GMSL) due to glacial isostatic adjustment (GIA), which depends on the viscoelastic properties of the solid Earth. During the last termination and through the Holocene, GIA-related isostatic uplift caused RSL to fall in regions formerly covered by ice sheets. Surrounding these uplifting regions is a narrow band of land where postglacial RSL fall was interrupted during the Holocene by a period of sea-level rise (i.e., a transgression) that culminated in a high stand before sea-level fall resumed. Holocene transgressions and high stands have been well documented in many locations including Norway, the Canadian Atlantic coast, the Canadian Pacific coast, Svalbard, the Baltic Sea, and the British Isles. A leading hypothesis poses that transgression occurred when GMSL rise outpaced isostatic rebound. We investigate the origins of these Holocene transgressions using GIA modeling and test the alternative hypothesis that they are predominantly the result of solid Earth deformation. Our results highlight a unique pattern of solid Earth deformation in which the region of subsidence (peripheral bulge) surrounding the ice sheet migrates first towards and then away from the melted ice mass. We show how this effect, which we term ‘reverse migration’, is the direct result of the contrast in viscosity between the upper and lower mantle. We compare our GIA model predictions of RSL change to two datasets: (1) RSL data from the last glacial maximum to present and (2) specific constraints on the transgression magnitude in Norway and Eastern Canada. Both datasets better fit RSL predicted by GIA models that include a mantle with a substantial (order of magnitude) increase in viscosity with depth over GIA predictions that do not include a contrast in mantle viscosity. We argue that this is a useful constraint on the local viscosity structure. Further, this suggests that in contrast to the conventional view that Holocene transgressions record GMSL temporarily outpacing isostatic uplift, solid Earth deformation and specifically reverse migration played an important role in generating near-field Holocene transgressions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 108986"},"PeriodicalIF":3.2,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strong coupling between the East Asian summer monsoon and regional hydrological conditions as evidenced by multiproxy stalagmite records for the last deglaciation","authors":"Wenna Ding ,&nbsp;Jingyi Cao ,&nbsp;Jinguo Dong ,&nbsp;Jiaqi Cong ,&nbsp;Yijia Liang ,&nbsp;Wei Huang","doi":"10.1016/j.quascirev.2024.109023","DOIUrl":"10.1016/j.quascirev.2024.109023","url":null,"abstract":"<div><div>Millennial-to centennial-scale abrupt climate events during the last glacial‒interglacial transition have significant relevance to modern-day extreme climate changes, which are occurring more frequently in the context of global warming. However, the regional expression of humidity conditions during the last deglaciation and their possible forcing mechanism in northern China are controversial. Here, combined with published δ¹⁸O data, we report 35-year-resolved δ¹³C and 76-year-resolved Mg/Ca and Sr/Ca records from a stalagmite from 15.3 to 10.9 ka BP from Lianhua Cave, northern China. The LH4 stalagmite δ¹⁸O record clearly records a weak monsoon event during the Younger Dryas (YD) from 12.8 to 11.6 ka BP and a strong monsoon event during the Bølling-Allerød (BA) from 14.6 to 12.8 ka BP. In addition, the δ¹³C and trace element ratio records, which represent local hydroclimatic changes, indicate wetter conditions during the BA and drier conditions during the YD, which appear to match well with the δ¹⁸O variations on the millennial timescale. A comparison of 28 records from 17 sites along the modern margin of the China summer monsoon revealed that the BA was characterized by wet conditions; inversely, the YD was characterized by dry conditions throughout northern China, which is obviously different from the consensus of the wet YD and the dry BA in northern northeastern China. The covariance in northern China suggests that the hydrological variation may be modulated by the advance and retreat of the large-scale East Asian summer monsoon (EASM) circulation. Further comparison revealed an anticorrelated relationship between millennial-scale precipitation changes in northern China and the middle‒lower reaches of the Yangtze River Valley during the last deglaciation. This correlation is analogous to the dipole precipitation mode at present, which is likely associated with the strength and position of the westerly jet and/or the western Pacific subtropical high, both of which play important roles in the spatial distribution of precipitation over eastern China.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 109023"},"PeriodicalIF":3.2,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retraction notice to “Delayed Western Gotland Basin (Baltic Sea) ventilation in response to the onset of a Mid-Holocene climate oscillation” [JQSR (2021) 107253]","authors":"Markus Czymzik ,&nbsp;Olaf Dellwig ,&nbsp;Raimund Muscheler ,&nbsp;Patricia Roeser ,&nbsp;Achim Brauer ,&nbsp;Jérôme Kaiser ,&nbsp;Marcus Christl ,&nbsp;Helge W. Arz","doi":"10.1016/j.quascirev.2024.109017","DOIUrl":"10.1016/j.quascirev.2024.109017","url":null,"abstract":"","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 109017"},"PeriodicalIF":3.2,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Worldwide consequences of a mid-Holocene cold event in the Nordic Seas","authors":"Maciej M. Telesiński ,&nbsp;Wei Liu ,&nbsp;Xianglin Ren ,&nbsp;Marek Zajączkowski","doi":"10.1016/j.quascirev.2024.109002","DOIUrl":"10.1016/j.quascirev.2024.109002","url":null,"abstract":"<div><div>The present interglacial is a relatively warm and stable period, especially compared to the preceding glacial time. However, the Holocene has seen the emergence of several remarkable cold events, some with worldwide consequences. Leveraging marine records from the Nordic Seas, we provide the first detailed account of a cold event centered around 6.8 ka BP. Utilizing paleoceanographic proxies and advanced modeling, we unveil a distinct subsurface water cooling, associated with a stepwise increase in sea-ice cover in the eastern Fram Strait. Our findings emphasize the role of Greenland Sea deep convection onset and the subsequent westward shift in Atlantic Water flow, enabling sea-ice advection from the Barents Sea. The heightened sea-ice cover weakened Atlantic Water advection, perturbing thermohaline circulation in the eastern Nordic Seas. These perturbations propagated worldwide, affecting North Atlantic deep-water circulation, inducing widespread hemispheric cooling, shifting the Intertropical Convergence Zone southward, and weakening the East Asian monsoon. Incorporating results from the Transient simulations of Climate Evolution of the last 21,000 years (TraCE-21ka) supports and augments proxy-based paleoreconstructions, underscoring sea-ice dynamics and ocean circulation's critical influence. This study highlights the potential for localized cold events within ostensibly warm climatic intervals. It underscores the need to comprehend their mechanisms for precise climate predictions and informed policymaking toward a sustainable future.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109002"},"PeriodicalIF":3.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term Holocene warming trend in Southern China revealed by corrected pollen data","authors":"Qiuchi Wan ,&nbsp;Cong Chen ,&nbsp;Kunshan Bao ,&nbsp;Xiao Zhang ,&nbsp;Yongjie Tang ,&nbsp;Xin Zhong ,&nbsp;Zhuo Zheng ,&nbsp;Kangyou Huang","doi":"10.1016/j.quascirev.2024.109015","DOIUrl":"10.1016/j.quascirev.2024.109015","url":null,"abstract":"<div><div>Holocene temperature changes and their forcings serve as pivotal references for current and future warming trends. However, significant discrepancies exist between proxy reconstructions and model simulations of Holocene temperature evolution. Pollen evidence, often central to these discrepancies, have been criticized for potentially reflecting human influence rather than pure temperature variations, complicating our understanding of Holocene temperature changes. Our study focuses on southern China, a region with pronounced discrepancies between models and proxies. We introduce and validate a novel methodology to isolate genuine temperature signals from pollen data. This approach employs an arboreal pollen-based temperature index and correct biases inherent in raw pollen data using the Regional Estimates of Vegetation Abundance from Large Sites (REVEALS) model. Applying this method, we present a new winter/annual temperature record for the past 10,000 years based on two fossil pollen data from the Luoxiao Mountains. Simultaneously, we reconstruct the historical impact of human activities in the region. Our temperature records reveal a sustained warming trend during the Holocene, closely matching model-simulated mean annual temperatures (R = 0.97), and temperature reconstructions based on branched glycerol dialkyl glycerol tetraethers from regional terrestrial and marine archives. In contrast, uncorrected pollen data indicate a cooling trend during the late Holocene, coinciding with significant human impact since approximately 3 ka BP. Our analysis and regional comparison with existing temperature records indicate that such contrasting temperature trends stem from a human-induced cooling bias, particularly pronounced in uncorrected pollen data. We infer that the early to middle Holocene warming was due to various factors, while late Holocene warming was predominantly driven by local annual insolation changes. Our findings challenge previously widely identified late-Holocene cooling trends based on uncorrected pollen data, demonstrating that the correction of pollen data can effectively mitigate human-induced cooling biases in temperature reconstructions. This study confirms the accuracy of climate models in simulating a Holocene warming trend, both temporally and spatially, at least in southern China.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109015"},"PeriodicalIF":3.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent sedimentology at the grounding zone of the Kamb Ice stream, West Antarctica and implications for ice shelf extent","authors":"Theo Calkin ,&nbsp;Gavin B. Dunbar ,&nbsp;Cliff Atkins ,&nbsp;Andrew Carter ,&nbsp;Jason J. Coenen ,&nbsp;Shaun Eaves ,&nbsp;Catherine E. Ginnane ,&nbsp;Nicholas R. Golledge ,&nbsp;David M. Harwood ,&nbsp;Huw J. Horgan ,&nbsp;Benjamin C. Hurwitz ,&nbsp;Christina Hulbe ,&nbsp;Justin D. Lawrence ,&nbsp;Richard Levy ,&nbsp;James W. Marschalek ,&nbsp;A.P. Martin ,&nbsp;Andrew D. Mullen ,&nbsp;Sarah Neuhaus ,&nbsp;Enrica Quartini ,&nbsp;Britney E. Schmidt ,&nbsp;Peter M. Washam","doi":"10.1016/j.quascirev.2024.108988","DOIUrl":"10.1016/j.quascirev.2024.108988","url":null,"abstract":"<div><div>Sediment accumulating beneath floating ice contains a record of ice dynamics in polar regions where <em>in situ</em> observations are rare. In 2019 a hole was melted through a 590m-thick region of the Ross Ice Shelf ∼5 km seawards of the Kamb Ice Stream (KIS) grounding line (82.7841°S, 155.2626°W) to access the seafloor. Imagery from a remotely operated vehicle (ROV, Icefin) shows ocean current-generated ripples likely formed by tidal flow parallel to the grounding line (GL). Observed current speeds &lt;0.15 m s⁻¹ suggest these bedforms may be relict. Larger, dm-scale, ‘furrows’ parallel to the former direction of KIS flow may relate to past grounding line processes. A 0.49 m-long gravity core collected from the seafloor contains weakly stratified diamicton. The sediment matrix comprises variable mixtures of reworked Tertiary biogenic silica, predominantly diatoms, and arkose material. Sediment ε_Nd values of ∼7 are consistent with derivation from the WAIS, as is the U-Pb age distribution and modelled late Holocene ice flows. Ramped pyrolysis ¹⁴C analysis shows all fractions are either &gt;30 ka or ¹⁴C dead. By contrast, ²¹⁰Pb-210 activity of &gt;30 Bq Kg⁻¹ indicates deposition within the last 120 years. The combination of features suggests rapid rainout deposition from melting of a sediment-laden basal debris layer as the GL retreated, followed by some reworking by ocean currents and little modern accumulation. Although Tertiary diatoms are abundant, unambiguously Late Quaternary forms are absent and we speculate on the implications for Ross Ice Shelf stability. [239 wds]</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108988"},"PeriodicalIF":3.2,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ice-sheet burial and erosion inferred from cosmogenic nuclide bedrock depth profiles: Implications for the glaciation history of northeastern Fennoscandia","authors":"Jane L. Andersen ,&nbsp;Mads F. Knudsen ,&nbsp;A.P. Stroeven ,&nbsp;Jesper Olsen ,&nbsp;Vivi K. Pedersen","doi":"10.1016/j.quascirev.2024.109010","DOIUrl":"10.1016/j.quascirev.2024.109010","url":null,"abstract":"<div><div>In this study, we evaluate the application of shallow (&lt;2.5 m) cosmogenic depth profiles in bedrock to constrain long-term ice-burial and erosion histories. Using Markov Chain Monte Carlo inversion modelling on a series of synthetic scenarios, we demonstrate that cosmogenic ¹⁰Be and ²⁶Al profiles provide more robust constraints on ice-burial duration and erosion histories than surface samples alone, particularly when erosion rates are low (&lt;5–10 m Myr⁻¹) and/or non-steady. We apply this method to new depth profiles of ¹⁰Be and ²⁶Al measurements from two tors in the Parkajoki region in northeastern Sweden. Our results indicate erosion depths of ∼2–10 m and ice burial for ∼20–35% of the time since 500 ka. These estimates imply more erosion and less ice burial than previously inferred from the same tors. However, by re-assessing the extent of ice cover during the Weichselian from existing records, we show that some cosmogenic nuclide inheritance predates the penultimate glacial maximum (Late Saalian), implying limited glacial erosion in the Parkajoki region during the last glacial cycle.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109010"},"PeriodicalIF":3.2,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing the evolution of debris-free and debris-covered glaciers during the end of the Lateglacial and the Holocene in Dudh Koshi basin, Everest region, Nepal","authors":"Vincent Jomelli ,&nbsp;Patrick Wagnon ,&nbsp;Joanna Charton ,&nbsp;Régis Braucher ,&nbsp;Leo Martin ,&nbsp;Irene Schimmelpfennig ,&nbsp;Didier Swingedouw ,&nbsp;Deborah Verfaillie ,&nbsp;Fanny Brun ,&nbsp;Stephanie Gairoard ,&nbsp;Dibas Shrestha","doi":"10.1016/j.quascirev.2024.108994","DOIUrl":"10.1016/j.quascirev.2024.108994","url":null,"abstract":"<div><div>Debris-covered glaciers are very frequent geomorphological features in Khumbu Himal (Nepal). Rock debris on the glacier surface play a significant role in glacier-climate relationships and glacier dynamics. These effects may cause an asynchronous evolution of debris-covered glaciers compared to debris-free glaciers at a multicentennial to millennial scale. Here, we explore this hypothesis by documenting and comparing the multi-millennial Holocene evolution of a debris-free glacier, Sabai glacier, and two debris-covered glaciers, Dig and Huuku glaciers, from adjacent catchments in Dudh Koshi basin (Everest region, Nepal). To do so, we dated rock samples collected from moraine boulders on both debris-covered and debris-free glaciers using the ¹⁰Be cosmic ray exposure (CRE) dating method. ¹⁰Be CRE ages obtained from 41 moraine boulder samples provide time constraints from ∼13.5 ka to 0.1 ka. While at Dig (debris-covered) and Sabai (debris-free) glaciers, no moraines from the Lateglacial and the Early Holocene are preserved, debris-covered Huuku glacier evidenced a large glacier extent during the Bølling-Allerød and Early Holocene with two moraines dated respectively to ∼13.5 ka and 11 ka, synchronously with most debris-free and debris-covered glaciers in this region. These two glacier advances are concomitant with enhanced monsoon precipitation supporting a qualitative relationship. The absence of debris landforms in the main valley question the nature of Huuku glacier during the Bølling-Allerød and Early Holocene, which could have been either debris-free or covered by a thin debris layer only. During the Mid Holocene, significant differences are observed in the evolution of the two glacier types. The two debris-covered glaciers recorded a significant advance at ∼4.8 ka, synchronous with that observed on other debris-covered glaciers in Khumbu valley. However, such glacier advance during the Mid Holocene was not evidenced on debris-free glaciers in the Dudh Koshi valley. Such a Mid Holocene glacier advance may have a spatial signature with frequent cases reported from both types of glaciers in the western part of High Mountain Asia, which are however infrequent in the arid and semi-arid southern and north-eastern Tibet. During the Late Holocene, both types of glaciers evolved similarly again, with moraines spanning the last two millennia, including the Little Ice Age, concomitant with enhanced monsoon precipitation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108994"},"PeriodicalIF":3.2,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The origin of the ice-free areas of the Hurd Peninsula (Livingston Island, Antarctica)","authors":"Marc Oliva ,&nbsp;David Palacios ,&nbsp;Leopoldo G. Sancho ,&nbsp;José M. Fernández-Fernández ,&nbsp;Attila Çiner ,&nbsp;Marcelo Fernandes ,&nbsp;Julia García-Oteyza ,&nbsp;M. Akif Sarıkaya ,&nbsp;Enrique Serrano ,&nbsp;Amaneh Kaveh-Firouz ,&nbsp;Augusto Pérez-Alberti ,&nbsp;Irene Schimmelpfennig ,&nbsp;Gonçalo Vieira ,&nbsp;Josep Bonsoms ,&nbsp;Dermot Antoniades ,&nbsp;ASTER Team","doi":"10.1016/j.quascirev.2024.108991","DOIUrl":"10.1016/j.quascirev.2024.108991","url":null,"abstract":"<div><div>Spatio-temporal patterns of glacial retreat determine the intensity of geomorphological, hydrological, and ecological processes in the ice-free areas of the Antarctic Peninsula region. The chronology of glacial oscillations in the region following the Last Glacial Maximum (LGM) is still poorly constrained and mostly limited to data from a few sites adjacent to research stations. The Hurd Peninsula, located on Livingston Island (South Shetland Islands), is mainly covered by the Hurd Peninsula Ice Cap (HPIC); there is a ca. 20 km² ice-free area downvalley of the ice cap in the peninsula's southern sector in addition to numerous nunataks that protrude above the HPIC. In this study, we present an approach combining two direct surface exposure dating methods, cosmic-ray exposure (CRE) dating and lichenometry, to reconstruct the spatio-temporal patterns of glacial thinning and ice cap retreat on the Hurd Peninsula. To understand the patterns of deglaciation on the peninsula, 26 samples for CRE dating (<em>in situ</em> cosmogenic ¹⁰Be) were taken from glacially polished surfaces and moraine boulders along a transect from the nunatak summits to the coast. On the most recent moraines, boulder stabilisation (i.e., indicative of glacier withdrawal) was dated through the longest axis of the 10 largest thalli of the lichen species <em>Rhizocarpon geographicum</em>. Ice thinning might have begun before the LGM at ca. 31.6 ka, when the highest areas close to the coast became exposed, and subsequently accelerated during the LGM at 20-18 ka. The upper surfaces were completely deglaciated between 16 and 14 ka. The HPIC was relatively stable until the mid-Holocene, when neoglacial advances of its outlet glaciers built moraines at ca. 4.5 ka. Subsequently, late Holocene polygenic moraines formed before the development of the external ridges of the most recent moraine system left by the HPIC outlets during the Little Ice Age, at 0.3 ka. The internal moraines correspond to glacial advances from the late 19th and early 20th centuries, as indicated by lichenometric dating. This work presents a comprehensive chronology of glacial oscillations on the Hurd Peninsula, enhancing our understanding of deglaciation patterns and offering insights into glacier dynamics due to climate variability and change.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108991"},"PeriodicalIF":3.2,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}